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Repair of the TOSHIBA 19DL833R TV

Technical description and composition of the TV TOSHIBA 19DL833R, panel type and modules used. The composition of the modules.

Model: 19DL833R
Chassis / Version: 17MB60-3.1
Panel: V185B1-LE2 REV. C1
LED driver (backlight): 17CON07-2
PWM LED driver: 3388DR
Power Supply (PSU): 17PW05-3
PWM Power: ICE3BR1765J (Standby), CAT7581
MOSFET Power: MDS5652
MainBoard: 17MB60-3.1
IC MainBoard: CPU: MSD9WB7PX; DRAM: HY5PS121621C; NAND Flash: NAND512-A
Tuner: DTOS403LH122E

Specifications 19DL833

General recommendations for the repair of TV LCD LED

If the TV does not turn on, no control lights are blinking and blinking, there are no sounds when turned on, not the slightest sign of operability - a malfunction in the power supply module is most likely. First of all, it is necessary to replace the swollen capacitors of the filters of the rectifiers, if they exist. If the mains fuse is broken in the power supply unit, in most cases the breakdown of the MDS5652 power switch (s) can be detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. You should also check the diodes of the rectifier bridge and the electrolytic capacitor of the power supply rectifier filter.
As a rule, the keys in a switching power supply (SMPS) are sufficiently reliable and rarely fail without reasons that should be sought by testing other circuit components — electrolytic capacitors, resistors, and semiconductor elements of the primary circuit. The PWM chip is checked by replacing it with a known-good one.
Sometimes the TOSHIBA 19DL833R has no picture, but there is sound, or the picture will appear and disappear immediately. In this case, there is a possibility of malfunctioning of the LED driver - the power supply of the LED backlight panel V185B1-LE2 REV. C1, or there may be an open circuit in the LED circuit. In such cases, first of all, it is necessary to ensure that the electrolytic capacitors of the filter are in good condition at the power supply of the backlight unit. 
Malfunction in the backlight circuits often occurs due to an open circuit in the power supply line of LEDs. It requires disassembly of the panel and verification of the LEDs themselves, the ration of their outputs, as well as the reliability of the connections in the connectors and the ration of the outputs of the connectors.
When trying to detect a break in the line of LEDs should be aware that to do this without disassembling the panel is difficult. For example, a current source is required to open PN junctions connected in series.
In cases of attempts to repair the motherboard 17MB60-3.1, it is necessary to check the functionality of the linear stabilizers and power supply circuits of its microchips and, if possible, update the software. BGA chips can sometimes be diagnosed using local heating. 
Complicated repair MB (SSB) is possible only in the conditions of the service center in the presence of the necessary equipment. Check or replace items CPU: MSD9WB7PX; DRAM: HY5PS121621C; NAND Flash: NAND512-A requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technology can be diagnosed by the warm-up method. 
If the TV works normally from external devices, but is not tuned to TV channels, the DTOS403LH122E tuner may be faulty. In such cases, first of all, you should make sure that the supply voltages are present at its respective terminals. It is also necessary to make sure that the tuner and the processor can exchange data on the I2C bus. Sometimes the failure of the tuner can be a software failure.
Remember! Attempts to self-repair users of the TOSHIBA 19DL833R TV without appropriate qualifications and the necessary experience can lead to serious negative consequences!

Download: Scheme and service manual :
TOSHIBA 19DL833R, 19DL834R, 19EL834R. Main VESTEL 17MB60

Additional Repair MainBoard

The appearance of the MainBoard 17MB60-3.1 is shown below:

The motherboard 17MB60-3.1 is made using an MSD9WB7PX-2 processor combined with a scaler. For its operation, two external memory chips (DDR) HY5PS121621C and a read-only memory (ROM) NAND512-A are used. To provide power for the processor, stabilizers 1.2V, 2.5V, 3.3V are used. For DDR, the voltage is 1.8V, to power the NAND 3.3V. Repair is advisable to start with checking the power standby mode (Stand-by) 3.3V. Further, in the operating mode, it is necessary to check the performance of all linear stabilizers and voltage converters. If there is a backlight and no image, the power of the LCD panel 5V or 12V, depending on the type of panel used, can be measured directly on the LVDS connector. Typical malfunction - NAND ROM software crash. At the same time, the TV does not turn on and blinks with indicators on the panel. It is updated via the USB port, if the software of the SPI FLASH chip in which the bootloader is located is not damaged, or if there is an mboot.bin file on the media, which can be used as regular SPI FLASH content.
17MB60-3.1 can be used in TVs:
TOSHIBA 19DL834R (Panel V185B1-LE2 30070337), TOSHIBA 22DL833R 22DL834R (Panel LC216EXN (SD) (A1)), TOSHIBA 22EL833R (Panel LC216EXN-SDA1 / LC216EXN-SCA1); TOSHIBA 19DL833R (Panel V185B1-LE2 REV. C1).
Power Supply Appearance 
The main features of the device TOSHIBA 19DL833R:
Installed matrix (LED-panel) V185B1-LE2 REV. C1. 
The LED driver 17CON07-2 is used to power the backlight LEDs, it is controlled by a 3388DR PWM controller. 
The formation of the necessary supply voltages for all nodes of the TOSHIBA 19DL833R TV is provided by the power supply module 17PW05-3, or its analogues using ICE3BR1765J (Standby), CAT7581 chips and power switches of the MDS5652 type. 
MainBoard - the main board (motherboard) is a 17MB60-3.1 module, using CPU chips: MSD9WB7PX; DRAM: HY5PS121621C; NAND Flash: NAND512-A and others. 
Tuner DTOS403LH122E provides reception of television programs and tuning to the channels.
Additional technical information on the panel:
Model: V185B1-LE2 
Type: a-Si TFT-LCD, Panel 
Diagonal size: 18.5 inch 
Resolution: 1366x768, WXGA 
Display Mode: TN, Normally White, Transmissive 
Active Area: 409.8x230. 4 mm 
Surface: Antiglare (Haze 25%), Hard coating (3H) 
Brightness: 250 cd / m² 
Contrast Ratio: 1000: 1 
Display Colors: 16.7M (8-bit), CIE1931 70% 
Response Time: 1.3 / 3.7 (Tr / Td) 
Frequency: 60Hz 
Lamp Type: 14S8P WLED Without Driver 
Signal Interface: LVDS (1 ch, 8-bit), 30 pins 
Voltage: 5.0V


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